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Merge pull request #278 from fgiannar/develop

updates
Fixed exception for activities on #274
The GET /api/csnclusters?graph_id="graph_id" response is the same as
if it were GET /api/csnclusters/{scnclusters_id}
Added baseline pricing id to SimParam.schema
Merge branch 'develop' of https://github.com/cassandra-project/platform into develop
Merge pull request #64 from cassandra-project/develop

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